Patent GB-894556-A (GB)
Title: Method of and apparatus for controlling structure according to a predetermined program of operation
Inventor: VANDERBITT VERN CORWIN
IPC: G05B19/00
Filed: 1958-08-11
Abstract: 894,556. Testing I.C. engines; electric measuring systems. PERFECT CIRCLE CORPORATION. Aug. 11, 1958, No. 25721/58. Classes 38 (6) and 40 (1). A system for controlling a member 46-such as an internal-combustion engine-in a predetermined manner, comprises making a record of the predetermined manner by means of a test member 11, transducer 12, amplifier 13 and recording-mechanism 14, verbal instruction being recorded by means of a microphone 43, the recorded information being read by a reader 14a and supplied to a comparator 64 by way of a band-pass filter in which comparator the information is compared with information representing the actual performance of the member 46, obtained by transducer 12a and amplifier 13a, the output of the comparator 64 controlling one or more servomotors which in turn control the member 46 to eliminate the difference in the controlling and actual information fed into the comparator 64, the comparator 64 alternately sampling the controlling and the actual signals. In the member under test-an internal-combustion engine 11-four factors are taken as being indicative of its performance, the engine speed given by a device 16, the inlet manifold pressure given by a transducer 17, the cooling water temperature given by a transducer 18 and the cooling oil temperature given by a transducer 19, the signals 16-19 having given frequency ranges and being compositely recorded in the recorder 14 in a single track on a magnetic tape. When the engine 46 is being tested under conditions simulating those of the engine 11, the devices 16a-19a produce signals corresponding to those from the devices 16-19 whereby by means of servomotors 82, 87, 91, 96 the signals 16-19 and 16a-19a are made to agree. The information spoken into the microphone 43 is reproduced at a loud-speaker 61. The transducers 17-19 and 17a-19a are similar in construction and produce frequencymodulated signals. In Fig. 2, which illustrates the construction, a constant-speed motor drives a disc 102 and a magnetic tape 237. A disc 106 which contacts the disc 102 edgewise and is driven thereby is slidable along a rod 107 and is positioned therealong according to the value of the factor being monitored by means of a bellows 19 and a bell-crank 122. Thus the frequency of the signal generated by the electromagnetic device 111, 113 is representative of the factor being monitored. The signal is recorded on the magnetic tape 237 by means of a recording head 234. There are four such devices driven by the disc 102, one of which is spare. The device 16 is similar to the electromagnetic device 111, 113. Fig. 3 shows the transducers 17a-19a wherein the recorded information on the tape is read by a reader 248 and fed into the comparator 64 wherein it is compared with the signal generated by a device 111a, 1 13a, the output of the comparator 64 controlling a servomotor 96 which controls the factor in the engine 46 under test which corresponds to that in the engine 11. If desired, a further factor may be introduced into the test; that of the throttle position. Electronic circuits are provided, wherein are undertaken certain operations on the various signals; such as sampling, amplitude limiting, differentiation, integration and amplification.